Steam-boiler furnace



R. WHELAN.

STEAM BOILER FURNACE. No. 341,196. Patented May 4,v 1886.

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(No Model.) 2 Sheets-Sheet 2. R. WHELAN.

STEAM BOILER FURNAGE.

No. 341,196. Patented May 4 1886.

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UNITED ST TES PATE T. OFFICE.

ROBERT XVHELAN, OF CHICAGO, ILLINOIS.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No.- 341,196, dated May 4, 1886.

Application filed February 5, 1886. Serial No. 190,916. (No model.)

To aZZ whom it may concern:

Be it known that I, ROBERT WHELAN, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improven'ients in Steam-Boiler Furnaces, of which the following is a specification.

Myinvention relates to boiler-furnaces, and particularly to the devices for feeding air or steam to the furnace so as to facilitate the decomposition of the gases and increase the draft.

In the drawings, Figure l is a perspective view of myimproved furnace; Fig. 2, asimilar view, partly in section; Fig. 8, a longitudinal vertical section 5 Fig. 4-, a vertical cross-section on the line so a: of Fig. 2; Fig. 5, a detail view of a portion of the shaking mechanism.

A indicates the furnace proper; B, the front wall thereof; (3, the grate, and D the bridgewall, said parts being arranged in substantially the customary manner.

Projecting from the inner face of the front wall, 13, is a metallic dead-plate, E, provided with a depending angular flange, F, as clearly shown in Fig. 3, upon which the front ends of the grate'bars rest. The plate E extends entirely across the furnace, and is supported at each end in the walls of the furnace.

The bridge'wall D contains a chamber, G, preferably of cast metal, and which, as shown in Fig. 3, communicates with and supports the rear ends of the hollow gratebars.

The front side of the upper portion of the chamber G is provided with slits or openings a, as shown in Figs. 2 and 3, through which steam or air, or both, may be discharged in a thin even stream upon the gases and flames as the latter pass over the bridge-wall.

Communicating with the chamber G at both ends are pipes H, which extend alongside the furnace-walls and along the front of the furnace, where they meet and communicate with a pipe, I, the pipesH I being provided with valves or cocks 1). Pipe I extends downward and inward through the front of the furnace under the plate E, where it is furnished with laterally-extend ing branches 0 and with forwardly-extending nipples cl, which communicate with the hollow grate-bars, as shown in Fig. 3.

The grate O is composed of hollow bars J K of the form shown in Figs. 3 and 4:, each alternat-ebar communicating at its forward end with a nipple, d, and at its rear end with the chamber G. The bars K rest upon the flange F at one end, and are supported at their rear ends by the bridgewall. Each of the bars K has a depending arm, L, near its forward end, as shown in Figs. 3 and 4, which are connected with arms 6 of the shaker-section M, as shown in Figs. 3, at, and 5, by bolts f. The shakersections M are two in number, and have journals g at each end, and a socket, h, for the shaker-handle, the shaker-sections beingjournaled in lugs N, secured to the under side of the plate E. It will thus be seen that as the forward or socket end of the shaker M is depressed, the front ends of the gratebars K are raised, the bars J remaining stationary.

In the side walls, near the front of the furnace, are openings '13, through each of which projects a flattened nozzle, 3, communicating with the pipesH, as shown in Figs. 3 and 4, through which steam or air may be discharged into the combnstion-chamber. From this construction it will be seen that the air or steam may be made to pass through the hollow bars J and into the chamber in the bridge-wall, or through the pipe H into the chamber G, or through both the bars and the pipes, as may be preferred or found desirable.

By arranging the alternate bars so as to shake I secure all the advantages of both an ordinary shaking grate and a hollow bar grate, and am enabled to use the hollow bars as conductors for air and steam.

The form of the bars J K may be modified, as desired.

Either steam or air,or both, may be caused to pass through the grate-bars, and thus prevent the latter from becoming unduly heated, and also aid materially the combustion by being discharged from the chamber G and the nozzlej.

As shown in Fig. 1, the pipe I,conveying the steam from the steam-dome, extends down into the smoke-box across the ends of the boilerfiues, whereby the steam is superheated and dried. The pipe I is formed into a small coil in the smoke-box, as shown, and extends outward through the front of the same, where it connects with the pipe II. An injector, P, is placed in the pipe I at a point between the steam-domeand the smoke-box,which,through the action of the steam,draws air into the pipe I. By these means air and steam are taken by the pipeIinto the coil in the smoke-chamber, where they are thoroughly heated and dried, and when delivered into the hollow grate-bars or the chamber in the bridgewall they are of sufficient temperature not to chill either.

IVhen it is desired to feed air alone to the combustion-chamber, the valve I) in the pipe I,between the injector I? and the steam-dome, is closed, and the air allowed to enter through the injector.

Owing to the heating of the pipes and the rarefaction of the air in the chamber G a strong current of air is induced through the injector and discharged into the grate-bars and the chamber G.

The grate bars may be perforated on their upper faces, if desired.

Having thus described my invention, what I claim is 1. Agrate composed of alternate fixed open or hollow and movable closed bars, in combination with devices, substantially such as shown, for shaking the movable bars thereof.

2. In combination with alternate fixed and movable bars, abridgewall, a chamber therein communicating with the fixed hollow bars, an opening in thefront face of the chamber, and a pipe communicating with the fixed hollow bars and with the chamber in the bridge-wall.

3. In combination with hollow bars K, a

chamber, G, connected with said bars at their rear ends and provided with a discharge-open ing a, a pipe communicating with the chamher at one end and with the hollow bars at the other, whereby steam or air may be caused to pass through the bars or directly into the chamber G, or both.

4. In combination with hollow bars K, chamber G at the rear ends thereof, pipes H I,eommunicating with the chamber and bars and with each other.

5. In combination with plate E, provided with flanges F, hollow bars K, chamber G,communicating therewith at the rear, pipes H I, communicating with the bars K and chamber G, lateral branches 0, and nipples (Z, all arranged and operating substantially as described.

6. In combination with furnace A, plate E, and bridge-wall G, bars J K, the former provided with depending arms L, shakers M, pivotcdin lugs N and connected with the arms L, and provided with socket N.

7. In a grate, the combinatiomwith plate E, having flange F, bars J K, bridge-wall D, chamberGtherein, and pipes H I, all arranged substantially as described.

' ROBERT \VIIELAN.

\Vitnesses:

J. E. MoKILLor, NEIL llrlohiiimhlw. 

